Wojciech Broniowski

Pion quadrupole polarizabilities in the Nambu--Jona-Lasinio model (2009)

Results of the Spectral Quark Model for the gravitational, electromagnetic, and transition form factors of the pion are discussed. In this model both the parton distribution amplitude and the parton...

Hiller, Brigitte, Broniowski, Wojciech, Osipov, Alexander A., Blin, Alex H.

We present the results for the pion electromagnetic quadrupole polarizabilities, calculated within the Nambu--Jona-Lasinio model. We obtain the sign and magnitude in agreement with the respective...

Application of chiral quarks to high-energy processes and lattice QCD (2009)

Quadrupole polarizabilities of the pion in the Nambu--Jona-Lasinio model (2009)

Results of the chiral quark models for the soft matrix elements involving pions and photons, relevant for high-energy processes, are reviewed. We discuss quantities related to the generalized parton...

Hiller, Brigitte, Broniowski, Wojciech, Osipov, Alexander A., Blin, Alex H.

The electromagnetic dipole and quadrupole polarizabilities of the neutral and charged pions are calculated in the Nambu--Jona-Lasinio model. Our results agree with the recent experimental analysis of...

Photon interactions and chiral dynamics (2009)

Broniowski, Wojciech, Dorokhov, Alexandr E., Arriola, Enrique Ruiz

Twist-2 components of the real and virtual photon distribution amplitudes are evaluated in several chiral quark models. The results, obtained at the quark model scale, are then evolved to higher...

Size fluctuations of the initial source and the event-by-event transverse momentum fluctuations in relativistic heavy-ion collisions (2009)

Broniowski, Wojciech, Chojnacki, Mikolaj, Obara, Lukasz

We show that the event-by-event fluctuations of the transverse size of the initial source, which follow directly from the Glauber treatment of the earliest stage of relativistic heavy-ion collisions,...

From chiral quark models to high-energy processes (2009)

A note on the QCD evolution of generalized form factors (2009)

We show the results of low-energy chiral quark models for soft matrix elements involving pions and photons. Such soft elements, upon convolution with the hard matrix elements, are relevant in various...

Initial conditions for hydrodynamics: implications for phenomenology (2008)

Generalized form factors of hadrons are objects appearing in moments of the generalized parton distributions. Their leading-order DGLAP-ERBL QCD evolution is exceedingly simple and the solution is...

Broniowski, Wojciech, Florkowski, Wojciech, Chojnacki, Mikolaj, Kisiel, Adam

It is shown how the initial azimuthally asymmetric flow develops from the free-streaming + sudden equilibration approximation to the early dynamics in relativistic heavy-ion collisions. Consequences...

Free-streaming approximation in early dynamics of relativistic heavy-ion collisions (2008)

Broniowski, Wojciech, Florkowski, Wojciech, Chojnacki, Mikolaj, Kisiel, Adam

We investigate an approximation to early dynamics in relativistic heavy-ion collisions, where after formation the partons are free streaming and around the proper time of 1 fm/c undergo a sudden...

Gravitational and higher-order form factors of the pion in chiral quark models (2008)

Azimuthally-sensitive femtoscopy from RHIC to LHC in hydrodynamics with statistical hadronization (2008)

The gravitational form factor of the pion is evaluated in two chiral quark models and confronted to the recent full-QCD lattice data. We find good agreement for the case of the Spectral Quark Model,...

Kisiel, Adam, Broniowski, Wojciech, Chojnacki, Mikolaj, Florkowski, Wojciech

Azimuthally-sensitive femtoscopy for heavy-ion collisions at RHIC and LHC is explored within the approach consisting of the hydrodynamics of perfect fluid followed by statistical hadronization. It is...

Pion electromagnetic form factor, perturbative QCD, and large-Nc Regge models (2008)

Generalized vector form factors of the pion in a chiral quark model (2008)

We present a construction of the pion electromagnetic form factor where the transition from large-Nc Regge vector meson dominance models with infinitely many resonances to perturbative QCD is built...

Pion pole light-by-light contribution to g-2 of the muon in a nonlocal chiral quark model (2008)

Generalized vector form factors of the pion, related to the moments of the generalized parton distribution functions, are evaluated in the Nambu--Jona-Lasinio model with the Pauli-Villars...

Dorokhov, Alexander E., Broniowski, Wojciech

We calculate the pion pole term of the light-by-light contribution to the $g-2$ of the muon in the framework of an effective chiral quark model with instanton-like nonlocal quark--quark interaction....

Soft-hadronic observables for relativistic heavy-ion collisions at RHIC and LHC (2008)

Florkowski, Wojciech, Chojnacki, Mikolaj, Broniowski, Wojciech, Kisiel, Adam

The relativistic hydrodynamics together with the single-freeze-out statistical hadronization model is used to describe the midrapidity hadron production in ultra-relativistic heavy-ion collisions at...

Generalized parton distributions of the pion (2008)

Broniowski, Wojciech, Arriola, Enrique Ruiz, Golec-Biernat, Krzysztof

Generalized Parton Distributions of the pion are evaluated in chiral quark models with the help of double distributions. As a result the polynomiality conditions are automatically satisfied. In...

Glauber Monte-Carlo predictions for LHC (2008)

Rybczynski, Maciej, Broniowski, Wojciech, Bozek, Piotr

In the framework of various Glauber-like models we compute several correlation observables in nuclear collisions at the SPS, RHIC, and LHC energies. We analyze fluctuations of the eccentricity of the...

Initial condition for hydrodynamics, partonic free streaming, and the uniform description of soft observables at RHIC (2008)

Broniowski, Wojciech, Chojnacki, Mikolaj, Florkowski, Wojciech, Kisiel, Adam

We investigate the role of the initial condition used for the hydrodynamic evolution of the system formed in ultra-relativistic heavy-ion collisions and find that an appropriate choice motivated by...

Soft heavy-ion physics from hydrodynamics with statistical hadronization - predictions for the Large Hadron Collider (2007)

Chojnacki, Mikolaj, Florkowski, Wojciech, Broniowski, Wojciech, Kisiel, Adam

Hydrodynamics merged with single-freeze-out statistical hadronization is used to describe the midrapidity hadron production in relativistic heavy-ion collisions at the highest RHIC energies and to...

Generalized parton distributions of the pion in chiral quark models and their QCD evolution (2007)

Broniowski, Wojciech, Arriola, Enrique Ruiz, Golec-Biernat, Krzysztof

We evaluate Generalized Parton Distributions of the pion in two chiral quark models: the Spectral Quark Model and the Nambu-Jona-Lasinio model with a Pauli-Villars regularization. We proceed by the...

GLISSANDO: GLauber Initial-State Simulation AND mOre (2007)

Broniowski, Wojciech, Rybczynski, Maciej, Bozek, Piotr

GLISSANDO is a Glauber Monte-Carlo generator for early-stages of relativistic heavy-ion collisions, written in c++ and interfaced to Root. Several models are implemented: the wounded-nucleon model,...

Large-Nc Regge models and the condensate (2007)

Fluctuation of the initial condition from Glauber models (2007)

We explore the role of the gluon condensate in matching Regge models to the operator product expansion of meson correlators.

Broniowski, Wojciech, Bozek, Piotr, Rybczynski, Maciej

We analyze measures of the azimuthal asymmetry, in particular the participant harmonic moments, epsilon*, in a variety of Glauber-like models for the early stage of collisions at RHIC. Quantitative...

Rapidity-dependent chemical potentials in a statistical approach (2007)

Broniowski, Wojciech, Biedron, Barlomiej

We present a single-freeze-out model with thermal and geometric parameters dependent on the position within the fireball and use it to describe the rapidity and transverse-momentum spectra of pions,...

Fluctuating initial conditions in heavy-ion collisions from the Glauber approach (2007)

Broniowski, Wojciech, Bozek, Piotr, Rybczynski, Maciej

In the framework of the Glauber approach we analyze the shape parameters of the early-formed system and their event-by-event fluctuations. We test a variety of models: the conventional wounded...

Pion-photon Transition Distribution Amplitudes in the Spectral Quark Model (2007)

pT-fluctuations and multiparticle clusters in heavy-ion collisions (2006)

The vector and axial pion-photon transition distribution amplitudes are analyzed in the Spectral Quark Model. We proceed by the evaluation of double distributions through the use of a manifestly...

Broniowski, Wojciech, Bozek, Piotr, Florkowski, Wojciech, Hiller, Brigitte

We investigate the centrality dependence of the pT-correlations in the event-by-event analysis of relativistic heavy-ion collisions at RHIC made recently by the PHENIX and STAR Collaborations. We...

Confined Chiral Solitons in the Spectral Quark Model (2006)

Arriola, Enrique Ruiz, Broniowski, Wojciech, Golli, Bojan

Chiral solitons with baryon number one are investigated in the Spectral Quark Model. In this model the quark propagator is a superposition of complex-mass propagators weighted with a suitable...

Rapidity-dependent spectra from a single-freeze-out model of relativistic heavy-ion collisions (2006)

Biedron, Bartlomiej, Broniowski, Wojciech

An extension of the single-freeze-out model with thermal and geometric parameters dependent on the spatial rapidity, $\alpha_\parallel$, is used to describe the rapidity and transverse-momentum...

SHARE: Statistical Hadronization with Resonances (2006)

Torrieri, Giorgio, Steinke, Steve, Broniowski, Wojciech, Florkowski, Wojciech, Letessier, Jean, Rafelski, Johann

SHARE is a collection of programs designed for the statistical analysis of particle production in relativistic heavy-ion collisions. With the physical input of intensive statistical parameters, it...

Dimension-2 condensates, zeta-regularization and large-Nc Regge Models (2006)

Pion transition form factor and distribution amplitudes in large-Nc Regge models (2006)

Dimension-2 and -4 gluon condensates are re-analyzed in large-Nc Regge models with the zeta-function regularization which preserves the spectrum in any q qbar channel separately. We demonstrate that...

Dimension-two gluon condensate from large-Nc Regge models (2006)

We analyze the pi -> gamma* gamma* amplitude in the framework of radial Regge models in the large-Nc limit. With the assumption of similarity of the asymptotic Regge rho and omega meson spectra we...

Femtoscopy in hydro-inspired models with resonances (2006)

It is shown that in the large-N_c limit radial Regge trajectories give rise in a natural way to the presence of the dimension-2 gluon condensate, , in meson correlators. We match these models to QCD...

Kisiel, Adam, Florkowski, Wojciech, Broniowski, Wojciech, Pluta, Jan

Effects of the choice of the freeze-out hypersurface and resonance decays on the HBT interferometry in relativistic heavy-ion collisions are studied in detail within a class of models with single...

Therminator: Thermal heavy-Ion generator (2005)

Kisiel, Adam, Taluc, Tomasz, Broniowski, Wojciech, Florkowski, Wojciech

THERMINATOR is a Monte Carlo event generator designed for studying of particle production in relativistic heavy-ion collisions performed at such experimental facilities as the SPS, RHIC, or LHC. The...

SHARE: Statistical Hadronization with Resonances (2005)

Torrieri, Giorgio, Steinke, Steve, Broniowski, Wojciech, Florkowski, Wojciech, Letessier, Jean, Rafelski, Johann

SHARE is a collection of programs designed for the statistical analysis of particle production in relativistic heavy-ion collisions. With the physical input of intensive statistical parameters, it...

SHARE: Statistical Hadronization with Resonances (2005)

Torrieri, Giorgio, Steinke, Steve, Broniowski, Wojciech, Florkowski, Wojciech, Letessier, Jean, Rafelski, Johann

SHARE is a collection of programs designed for the statistical analysis of particle production in relativistic heavy-ion collisions. With the physical input of intensive statistical parameters, it...

Hydro-inspired parameterizations of freeze-out in relativistic heavy-ion collisions (2004)

Application of chiral quark models to high-energy processes (2004)

Popular parameterizations of the freeze-out conditions in relativistic heavy-ion collisions are discussed. Similarities and differences between the blast-wave model and the single-freeze-out model,...

Landau-gauge condensates from the quark propagator on the lattice (2004)

We discuss the predictions of chiral quark models for basic pion properties entering high-energy processes: generalized parton distributions (GPD's) and unintegrated parton distributions (UPD's). We...

Arriola, Enrique Ruiz, Bowman, Patrick Oswald, Broniowski, Wojciech

We compute the dimension-2 condensate, , and the dimension-4 mixed condensate, , from the recent quenched lattice results for the quark propagator in the Landau gauge. We fit the lattice data to the...

Kwiecinski evolution of unintegrated parton distributions (2004)

Update of the Hagedorn mass spectrum (2004)

The Kwiecinski evolution of unintegrated parton distributions (UPDs) in the transverse-coordinate space is analyzed with the help of the Mellin transform. Numerical results are presented for the...

Broniowski, Wojciech, Florkowski, Wojciech, Glozman, Leonid Ya.

We present an update of the Hagedorn hypothesis of the exponential growth of the number of hadronic resonances with mass. We use the newest available experimental data for the non-strange mesons and...

SHARE: Statistical Hadronization with Resonances (2004)

Torrieri, Giorgio, Steinke, Steve, Broniowski, Wojciech, Florkowski, Wojciech, Letessier, Jean, Rafelski, Johann

SHARE is a collection of programs designed for the statistical analysis of particle production in relativistic heavy-ion collisions. With the physical input of intensive statistical parameters, it...

Solution of the Kwiecinski evolution equations for unintegrated parton distributions using the Mellin transform (2004)

Production of resonances in a thermal model (2004)

The Kwiecinski equations for the QCD evolution of the unintegrated parton distributions in the transverse-coordinate space (b) are analyzed with the help of the Mellin-transform method. The equations...

Broniowski, Wojciech, Florkowski, Wojciech, Hiller, Brigitte

We discuss the pi+ pi- invariant-mass correlations and the resonance production in a thermal model with single freeze-out. The predictions are confronted with the data from the STAR Collaboration.

Resonance production in a thermal model (2003)

The Spectral Quark Model and Light Cone Phenomenology (2003)

We discuss the pi+ pi- invariant-mass correlations and the resonance production in a thermal model with single freeze-out. The predictions are confronted with the recent data from the STAR...

Arriola, E. Ruiz, Broniowski, Wojciech

Chiral quark models offer a practical and simple tool to describe covariantly both low and high energy phenomenology in combination with QCD evolution. This can be done in full harmony with chiral...

Impact-Parameter Dependence of the Diagonal GPD of the Pion from Chiral Quark Models (2003)

Impact-parameter dependence of the generalized parton distribution of the pion in chiral quark models (2003)

We analyze the impact-parameter dependent diagonal non-singlet generalized parton distribution of the pion in two distinct chiral quark models: the Spectral Quark Model and the Nambu-Jona-Lasinio...

Thermal analysis of production of resonances in relativistic heavy-ion collisions (2003)

We compute the off-forward diagonal non-singlet generalized parton distribution of the pion in two distinct chiral quark models: the Nambu-Jona-Lasinio model with the Pauli-Villars regulator and the...

Broniowski, Wojciech, Florkowski, Wojciech, Hiller, Brigitte

Production of resonances is considered in the framework of the single-freeze-out model of ultra-relativistic heavy ion collisions. The formalism involves the virial expansion, where the probability...

Unintegrated parton distributions of pions and nucleons from the CCFM equations in the single-loop approximation (2003)

Gawron, Agnieszka, Kwiecinski, Jan, Broniowski, Wojciech

The unintegrated quark and gluon distributions in the pion and nucleon are analysed using the CCFM equations in the single-loop approximation. We utilise the transverse-coordinate (or...

Spectral quark model and low-energy hadron phenomenology (2003)

Thermal model for RHIC, part I: particle ratios and spectra (2002)

We propose a spectral quark model which can be applied to low energy hadronic physics. The approach is based on a generalization of the Lehmann representation of the quark propagator. We work at the...

Thermal model at RHIC, part II: elliptic flow and HBT radii (2002)

A simple thermal model with single freeze-out and flow is used to analyze the ratios of hadron yields and the hadron transverse-mass spectra measured in 130 GeV Au+Au collisions at RHIC. An overall...

Broniowski, Wojciech, Baran, Anna, Florkowski, Wojciech

We continue the analysis of the preceding talk with a discussion of the elliptic flow and the HBT pion correlation radii. It is shown that the thermal model can be extended to describe these...

Approximating chiral quark models with linear sigma-models (2002)

Broniowski, Wojciech, Golli, Bojan

We study the approximation of chiral quark models with simpler models, obtained via gradient expansion. The resulting Lagrangian of the type of the linear sigma-model contains, at the lowest level,...

Thermal approach to RHIC (2002)

Broniowski, Wojciech, Baran, Anna, Florkowski, Wojciech

Applications of a simple thermal model to ultra-relativistic heavy-ion collisions are presented. We compute abundances of various hadrons, including particles with strange quarks, the pT-spectra, and...

Thermal description of transverse-momentum spectra at RHIC (2002)

Pion light-cone wave function and pion distribution amplitude in the Nambu-Jona-Lasinio model (2002)

We show that the transverse-momentum spectra of all hadrons measured at RHIC, including hyperons, are described very well in a thermal model assuming the simultaneous chemical and thermal...

How much is RHIC different from SPS? Comparison of the pT-spectra (2002)

We compute the pion light-cone wave function and the pion quark distribution amplitude in the Nambu-Jona-Lasinio model. We use the Pauli-Villars regularization method and as a result the distribution...

Explanation of the RHIC pt-spectra in a single-freeze-out model (2002)

We show, by means of a simple compilation of the available experimental results, that the pT-spectra obtained at RHIC and SPS are strikingly similar up to pT ~ 1.5-2 GeV. In fact, the discrepancies...

pion-rho-omega vertex in nuclear matter (2002)

The pt-spectra of hadrons measured at RHIC are very well described in a model which assumes that the chemical and thermal freeze-outs occur simultaneously. The model calculation includes all hadronic...

Baran, Anna, Bieniek, Agnieszka, Broniowski, Wojciech

Medium modifications of the pion-omega-rho vertex are analyzed in context of the omega -> pi gamma* and rho -> pi gamma* decays in nuclear matter. A relativistic hadronic model with mesons, nucleons,...

Thermal model at RHIC: particle ratios and pT spectra (2002)

Strange particle production at RHIC in a single-freeze-out model (2001)

Predictions of the single-freeze-out model for the particle spectra at RHIC are presented. The model assumes that the chemical and thermal freeze-outs occur simultaneously, and incorporates in simple...

Solitons in nonlocal chiral quark models (2001)

Strange particle ratios and pT-spectra are calculated in a thermal model with single freeze-out, previously used successfully to describe non-strange particle production at RHIC. The model and the...

Broniowski, Wojciech, Golli, Bojan, Ripka, Georges

Properties of hedgehog solitons in a chiral quark model with nonlocal regulators are described. We discuss the formation of the hedgehog soliton, the quantization of the baryon number, the energetic...

pi^0 -> gamma gamma*, omega -> pi^0 gamma*, and rho -> pi gamma* decays in nuclear medium (2001)

Bieniek, Agnieszka, Baran, Anna, Broniowski, Wojciech

We calculate the medium modification of the pi-omega-rho vertex and analyze its significance for the pi^0 -> gamma gamma*, omega -> pi^0 gamma*, and rho -> pi gamma* decays in nuclear matter. We use...

Description of the RHIC p_T-spectra in a thermal model with expansion (2001)

Thermal analysis of particle ratios and p_T spectra at RHIC (2001)

The assumption of simultaneous chemical and thermal freeze-outs of the hadron gas leads to a surprisingly accurate, albeit entirely conventional, explanation of the recently-measured RHIC pT spectra....

Florkowski, Wojciech, Broniowski, Wojciech, Michalec, Mariusz

The thermal model of particle production is used to analyze the particle ratios and the p_T spectra measured recently at RHIC. Our fit of the particle ratios yields the temperature at the chemical...

Scaling of hadron masses and widths in thermal models for ultra-relativistic heavy-ion collisions (2001)

Michalec, Mariusz, Florkowski, Wojciech, Broniowski, Wojciech

By means of a simple rescaling, modifications of hadron masses and widths are incorporated into the thermal analysis of particle ratios in ultra-relativistic heavy-ion collisions. We find that...

rho -> pi pi decay in nuclear medium (2001)

Broniowski, Wojciech, Florkowski, Wojciech, Hiller, Brigitte

We calculate the medium modifications of the rho pi pi vertex in a relativistic hadronic framework, incorporating nucleons and Delta(1232) isobars. We find a substantial increase of the rho pi pi...

Description of the RHIC p [perpendicular] Spectra in a Thermal Model with Expansion (2001)

Distinct Hagedorn temperatures from particle spectra: a higher one for mesons, a lower one for baryons (2000)

Two Hagedorn temperatures: a larger one for mesons, a lower one for baryons (2000)

We analyze experimental particle spectra and show that the Hagedorn temperature is significantly larger for mesons than for baryons. The effect can be explained within dual string models: excitations...

Different Hagedorn temperatures for mesons and baryons from experimental mass spectra, compound hadrons, and combinatorial saturation (2000)

We show that the Hagedorn temperature obtained from experimental spectra is larger for mesons than for baryons. Dual string models explain this behavior asymptotically.

Non-uniform chiral phase in effective chiral quark models (2000)

We analyze the light-flavor particle mass spectra and show that in the region up to ~1.8GeV the Hagedorn temperature for baryons is about 30% smaller than for mesons, reflecting the fact that the...

Sadzikowski, Mariusz, Broniowski, Wojciech

We analyze the phase diagram in effective chiral quark models (the Nambu-Jona-Lasinio model, the sigma-model with quarks) and show that at the mean-field level a phase with a periodically-modulated...

Chiral restoration in effective quark models with non-local interactions (1999)

Szczerbinska, Barbara, Broniowski, Wojciech

Chiral restoration at finite temperatures is studied in chiral quark models with non-local regulators. At the leading-N_c level we find transition temperatures of the order of 100MeV. Meson-loop...

Mesons in non-local chiral quark models (1999)

Gauging non-local quark models (1999)

Vector meson correlators are studied in effective chiral quark models with both local and non-local regulators. A set of sum rules based on dispersion relations is derived, which allows for a...

Matter-induced omega -> pi pi decay (1999)

Gauging of effective chiral quark models with non-local regulators is discussed in the context of solitons. In particular, we show that with the P-exponent method the current algebra is satisfied and...

Broniowski, Wojciech, Florkowski, Wojciech, Hiller, Brigitte

We calculate the width for the omega -> pi pi decay in nuclear matter in a hadronic model including mesons, nucleons and Delta isobars. We find a substantial width of the longitudinally polarized...

Collective modes and current-algebraic sum rules in nuclear medium (1998)

Broniowski, Wojciech, Hiller, Brigitte

In-medium sum rules following from the chiral charge algebra of QCD are reviewed, and new sum rules are derived. The new sum rules relate the I^G(J^{PC})=1^-(0^{++}) excitations (quantum numbers of...

Solitons in a chiral quark model with non-local interactions (1998)

Golli, Bojan, Broniowski, Wojciech, Ripka, Georges

Hedgehog solitons are found in a chiral quark model with non-local interactions. The solitons are stable without the chiral-circle constraint for the meson fields, as was assumed in previous...

Tensor susceptibilities of the vacuum from constituent quarks (1998)

Broniowski, Wojciech, Polyakov, Maxim, Kim, Hyun-Chul, Goeke, Klaus

We show that the constituent quark model leads to simple expressions for the isoscalar and isovector tensor susceptibilities of the vacuum. The found values are negative and of magnitude compatible...

rho-omega mixing in relativistic heavy-ion collisions (1998)

Fixed-Velocity Chiral Sum Rules for Nuclear Matter (1997)

We show that even moderate excess of neutrons over protons in nuclear matter, such as in ${}^{208} Pb$, can lead to large $\rho$-$\omega$ mixing at densities of the order of twice the nuclear...

Cohen, Thomas D., Broniowski, Wojciech

Infinite sets of sum rules involving the excitations of infinite nuclear matter are derived using only completeness, the current algebra implicit in QCD, and relativistic covariance. The sum rules...

Current algebra and soft pionic modes in asymmetric quark matter (1996)

Broniowski, Wojciech, Hiller, Brigitte

Pionic excitations are analyzed in isospin-asymmetric Fermi gas of constituent quarks. It is found that in addition to the usual pionic excitations, there exists a very low collective mode with...

Melting of the quark condenstate in the NJL model with meson loops (1996)